28 C. W. M. Poynter 



found the bifurcation of the upper end of the sulcus centralis in 

 a Javanese female babe, and quotes Giacomini as having found 

 the condition four times in his series of brains; all cases being in 

 women. 



The sulcus centralis develops in two portions, and this may be 

 the interpretation of the condition known as an interrupted sulcus. 

 Retzius considers the condition very rare, having never encoun- 

 tered it except in the foetal brain about the end of the sixth 

 month. While we may look on the condition as indicative of 

 arrested development, there is no evidence to show that it is in 

 any way related to limited mentality. The above table repre- 

 sents all of the cases I have been able to find in literature, and the 

 number of brains in the series in which they were found. 



The duplication of the sulcus centralis is a still more infre- 

 quent condition. Sperino (1901a) reports finding it in the brain 

 of Dr. Giacomini ; it is interesting to note that Giacomini is the 

 first to report the condition. Sperino also collected the cases 

 from literature as follows. 



TABLE OF REPORTED CASES OF DUPLICATION OF THE SULCUS CENTRALIS 

 Author No. of Hemispheres Remarks. 



Giacomini (1882) iR, iL. Idiot. 



Funaioli ( 1883) iR, iL. Normal woman. 



Legge (1884) iR. Berbera woman. 



Tenchini (1885) iL. Criminal. 



Valenti ( 1890) iR, iL. Suicide. 



Debierre (1893) iL. 



Mondio (1895) iR, iL. Criminals. 



Poirier (1895) 2. Cases of Vanherseke. 



Saporito (1898) «... 2R, 3L. In women. 



Tricomi-Allegra (1900) iR, iL. Criminals. 



Varaglia (1900) iL. Crirriinal woman. 



Focacci (1900) iR. Woman. 



Sperino (1901) iR, iL. Brain of Giacomini 



and of a criminal. 



It is questionable whether all of these cases are true duplica- 

 tions of the sulcus. Sperino questions one of Mondio's cases, 

 that of Legge, and some of those of Saporito ; Giacomini, likewise, 

 questioned the latter. This list does not include the case claimed 



372 



